DC Generators
When two D.C. generators are running in parallel an equalizer bar is used

So that the two identical machines will pass approximately equal currents to the load
To reduce the combined effect of armature reaction of both the machines
To increase the generated e.m.f.
To increase the series flux

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DC Generators
In D.C. generators the polarity of the interpoles

Is the same as that of the main pole ahead
Is opposite to that of the main pole ahead
Is the same as that of the immediately preceding pole
Is neutral as these poles do not play part in generating e.m.f.

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